US8902378B2 - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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Publication number
US8902378B2
US8902378B2 US12/833,147 US83314710A US8902378B2 US 8902378 B2 US8902378 B2 US 8902378B2 US 83314710 A US83314710 A US 83314710A US 8902378 B2 US8902378 B2 US 8902378B2
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led
light
led array
light guide
lower cover
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US12/833,147
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US20110007242A1 (en
Inventor
Sang-hyun Lee
Won-Taek Moon
Yong-Ik Hwang
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LG Display Co Ltd
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LG Display Co Ltd
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Assigned to LG DISPLAY CO., LTD. reassignment LG DISPLAY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HWANG, YONG-IK, LEE, SANG-HYUN, MOON, WON-TAEK
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133608—Direct backlight including particular frames or supporting means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0028—Light guide, e.g. taper
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133612—Electrical details
    • G02F2001/133612—

Definitions

  • the present invention relates to a liquid crystal display (LCD) device and, more particularly, an LCD device for supplying light to a liquid crystal panel by using a plurality of light emitting diodes (LEDs).
  • LCD liquid crystal display
  • LEDs light emitting diodes
  • an LCD is a display device for displaying a desired image by adjusting a light transmittance of pixels by separately supplying data signals according to image information to the pixels arranged in a matrix form.
  • the LCD device includes a driving unit for driving the liquid crystal display panel with the pixels arranged in the matrix form thereon and the pixels.
  • the liquid crystal panel includes a thin film transistor (TFT) array substrate and a color filter substrate attached in a facing manner with a uniform cell gap maintained therebetween, and a liquid crystal layer formed in the cell gap between the array substrate and the color filter substrate.
  • TFT thin film transistor
  • a common electrode and pixel electrodes are formed on the liquid crystal display panel, which is formed as the array substrate and the color filter substrate are attached, to apply electric field to the liquid crystal layer.
  • liquid crystal of the liquid crystal layer is rotated due to dielectric anisotropy according to the electric field between the common electrode and the pixel electrodes, thus transmitting light or interrupting light by pixels to allow for display of characters or images.
  • the LCD device is a light receiving device that displays an image by adjusting the transmittance of light coming from an external light source, rather than emitting light by itself, so it requires a device, namely, a backlight, for supplying light to the liquid crystal panel.
  • the backlight is divided into a side type backlight in which lamps are disposed at one side or at both sides of the liquid crystal panel and light is reflected, diffused and concentrated through a light guide plate, a reflection plate and optical sheets so as to be transmitted to a front surface of the liquid crystal panel and a direct type backlight in which lamps are disposed on a rear surface of the liquid crystal panel so as to be directly transmitted to the front side of the liquid crystal panel.
  • FIG. 1 is a perspective view of a general side type backlight.
  • the side type backlight includes a light guide plate 41 disposed on a rear surface of the liquid crystal panel (not shown), lamps 25 disposed at the side of the light guide plate 41 , a reflection plate 42 disposed on a rear surface of the light guide plate 41 , a lamp holder (not shown) for fixing the lamps 25 to the side of the light guide plate 41 , and wirings 27 applying power to the lamps 25 .
  • Light generated from the lamps 25 are made incident to the side of the light guide plate 41 made of a transparent material, and the reflection plate 42 disposed on the rear surface of the light guide plate 42 reflects light transmitted to the rear surface of the light guide plate 41 to an upper surface of the light guide plate 41 , thus reducing a loss of light and improving uniformity.
  • a tube type cold cathode fluorescence lamp having a length corresponding to a longer side distance or a shorter side distance of the liquid crystal panel is applied, and the CCFL generates white light by power supplied through the wirings 27 at both sides thereof.
  • a fluorescent discharge tube encapsulating mercury (Hg) gas with argon (Ar), neon (Ne), or the like, added thereto is used as a fluorescent tube in order to use a penning effect.
  • electrodes are formed at both ends of the fluorescence discharge tube, and a negative electrode is formed to be large in a plate form, and when voltage is applied thereto, charge particles within the discharge tube collides with the negative electrode in the plate shape, like a sputtering phenomenon, to generate secondary electrons, and the generated secondary electrons excite the nearby elements to form plasma.
  • These elements emit strong ultraviolet rays, and as the emitted ultraviolet rays excite phosphor again, the phosphor emits visible rays.
  • the backlight using the CCFL has not good color reproduction because the light source, namely, the CCLF, does not have good light emission characteristics.
  • the size and capacity of the fluorescent lamp are limited, a backlight of a high luminance cannot be obtained.
  • a light emitting diode receives much attention as a light source of the backlight.
  • the LED has a longer life span than that of the CCFL, and because it operates at a DC of 5V, it does not need an inverter.
  • the high luminance LED has a longer life span than that of the CCFL and consumes power 20% of the existing product, and because the high luminance LED does not need additional equipment such as an inverter or the like, it is advantageous for making a product thinner and effectively use an inner area. Also, its color implementation capability is evaluated to be superior to the CCFL, and the full-fledged regulation since 2006 worldwide supports the adoption of the LED backlight.
  • FIG. 2 is a sectional view schematically showing a general LCD using an LED backlight.
  • an LED array 20 generating light As shown in FIG. 2 , in the general side-type LED backlight LCD, an LED array 20 generating light, an LED printed circuit board (PCB) 21 for driving the LED and a reflective plate 42 are installed on a lower cover 50 , and an LED housing reflector 55 is attached to an upper portion of the lower cover 50 at an upper side of the LED array 20 .
  • PCB printed circuit board
  • a light guide plate 41 is installed in a direction in which the LED array 20 outputs light, and in this case, a plurality of LEDs constituting the LED array 20 are positioned between LEDs at a certain interval in order to obtain an overall luminance uniformity of the backlight.
  • the reflective plate 42 positioned under the light guide plate 41 serves to reflect light outputted from the LED array 20 toward the lower cover 50 to transmit it toward optical sheets 43 .
  • the LED housing reflector 55 reflects light outputted toward the upper portion of the lower cover 50 from the LED array 20 to transmit it toward the optical sheets 43 .
  • a liquid crystal panel 10 composed of a TFT array substrate and a color filter substrate is mounted on an upper portion of the LED backlight thusly configured and coupled with an adhesive tape 11 through an upper case (not shown) to form the LCD.
  • the thickness of respective main components In order to make the existing LED backlight thinner, the thickness of respective main components must be minimized. However, the performances such as the minimization of thickness, an optical efficiency and mechanic reliability are traded off each other, causing a limitation in minimizing the thickness.
  • An aspect of the present invention provides a liquid crystal display (LCD) device having an LED backlight that does not cause a problem with respect to an environmental regulation of a cold cathode fluorescence lamp (CCFL).
  • LCD liquid crystal display
  • Another aspect of the present invention provides an LCD device which is thinner and lighter, and has a reduced cost and processing time by omitting an LED housing reflector.
  • Another aspect of the present invention provides an LCD device capable of effectively coping with a reduction in the quantity of light resulting from a lighter and thinner configuration.
  • an LCD device including: a liquid crystal panel; an LED array supplying light to the liquid crystal panel; a light guide plate installed in a direction in which the LED outputs light, and guiding light; a reflection plate formed between the LED array and a lower portion of a lower cover; and an LED PCB attached to an upper portion of the lower cover at an upper side of the LED array and having a reflection layer formed at a side facing the light guide plate.
  • a method for fabricating an LCD device including: providing a liquid crystal panel; providing an LED array for generating light to the liquid crystal panel; providing a reflection plate between the LED array and a lower portion of the lower cover; providing a light guide plate in a direction in which the LED array outputs light; and attaching an LED PCB having a reflection layer to an upper portion of the lower cover at an upper side of the LED array, wherein the reflection layer is formed at a side facing the light guide plate.
  • the LCD according to an exemplary embodiment of the present invention can properly cope with an environmental regulation that is gradually strengthened, because it does not cause such a problem with the environmental regulation as a CCFL.
  • the LED PCB with the reflection layer formed on surface thereof is installed at an upper side of the LED array and the reflection plate extends such that it sufficiently covers the lower portion of the LED array to thus make light emitted from the light source incident to its maximum level, thus making the LCD device thinner, and accordingly, coping with the reduction in the quantity of light.
  • the problem as in the related art in which the reflection plate extends to overlap is basically avoided, so the reflection efficiency of the reflection plate can be increased by 5% or greater.
  • the LED housing reflector is omitted, the cost is reduced, a process for assembling the LED housing reflector can be also omitted, obtaining the effects that the processing time can be reduced, a defective rate can be reduced, a production yield can be improved, and the workability can be improved.
  • FIG. 1 is a perspective view schematically showing a general side type backlight
  • FIG. 2 is a sectional view schematically showing the structure of a general LCD device using LED emission lamps
  • FIG. 3 is a perspective view schematically showing the structure of an LCD using LED emission lamps according to an exemplary embodiment of the present invention.
  • FIG. 4 is a sectional view taken along line A-A′ of the LCD illustrated in FIG. 3 .
  • LCD liquid crystal display
  • FIG. 3 is a perspective view schematically showing the structure of an LCD using LED emission lamps according to an exemplary embodiment of the present invention
  • FIG. 4 is a sectional view taken along line A-A′ of the LCD illustrated in FIG. 3 .
  • an LED array 120 for generating light and a reflection plate 142 are installed on a lower cover 150 , and an LED PCB 121 on which a certain driving circuit for driving the LED is mounted is attached to an upper portion of the lower cover 150 above the LED array 120 .
  • a light guide plate 141 is installed in a direction in which the LED array 120 outputs light, and a plurality of LEDs (not shown) constituting the LED array 120 may be positioned at a certain interval between the LEDs to obtain an overall luminance uniformity of a backlight.
  • the plurality of LEDs may be installed to be connected on the LED PCB 121 .
  • the LED array 120 is installed at one side of the light guide plate 141 , but the present invention is not limited thereto and the LED array 120 may be installed at both sides of the light guide plate 141 .
  • the reflection plate 142 is formed to extend to the LED array 120 such that it sufficiently covers the lower portion of the LED array 120 , whereby the reflection plate 142 can reflect light outputted from the LED array 120 toward the lower portion of the lower cover 150 to its maximum level and transmits the light to optical sheets 143 .
  • the LED PCB 121 attached to the upper portion of the lower cover 150 above the LED array 120 includes a certain reflection layer 122 formed on the side facing the light guide plate 141 in order to replace the existing LED housing reflector, and reflects light outputted from the LED array 120 toward the upper portion of the lower cover 150 to transmit it toward the optical sheets 143 .
  • a thickness d 2 of the LCD device is reduced to meet the demand for making the display thinner, because the process for assembling the existing LED housing reflector is omitted, the processing time can be reduced, a defective rate can be reduced, a production yield can be improved, and workability can be improved.
  • the LED PCB 121 plays the role of the existing LED housing reflector that reflects light proceeding to the upper portion of the lower cover 150 toward a light receiving portion of the light guide plate 141 .
  • a light efficiency improvement material such as white photo solder resists (PSR), polyimide (PI), or the like, is coated on the LED PCB 121 , thus reflecting light outputted from the LED array 120 to the light receiving portion of the light guide plate 141 .
  • the existing reflection plate extends to the LED array 120 between the LED array 120 and the lower portion of the lower cover 150 such that it sufficiently covers the lower portion of the LED array 120 , thus reflecting light outputted to the lower side from the LED array 120 , to the light receiving portion of the light guide plate 141 .
  • the LED PCB 121 is elastic so to be maintained to be flat, and the lower cover 150 may be configured such that its upper portion becomes narrower toward the lower portion at a position at which the LED array 120 is inserted.
  • the liquid crystal panel 110 composed of a TFT array substrate and a color filter substrate is mounted on an upper portion of the LED backlight thusly configured and is coupled with an adhesive tape 111 through an upper case (not shown) to form the LCD.
  • a plurality of gate lines and a plurality of data lines are arranged vertically and horizontally to define a plurality of pixels on the TFT array substrate, and each pixel include a TFT so as to be driven as a scan signal is applied from an external source along the gate line. Also, each pixel includes a pixel electrode, and as the TFT of each pixel is driven, an image signal is inputted from an external source along the data line.
  • the color filter substrate includes a black matrix for blocking light transmission to a non-image display area and a color filter layer implementing actual color, and a liquid crystal layer is formed between the TFT array substrate and the color filter substrate.
  • the LED PCB with the reflection layer formed on surface thereof is installed at an upper side of the LED array and the reflection plate extends such that it sufficiently covers the lower portion of the LED array to thus make light emitted from the light source incident to its maximum level, thus making the LCD device thinner, and accordingly, coping with the reduction in the quantity of light.
  • the problem as in the related art in which the reflection plate extends to overlap is basically avoided, so the reflection efficiency of the reflection plate can be increased by 5% or greater.
  • the LED housing reflector is omitted, the cost is reduced, a process for assembling the LED housing reflector can be also omitted, obtaining the effects that the processing time can be reduced, a defective rate can be reduced, a production yield can be improved, and the workability can be improved.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
US12/833,147 2009-07-09 2010-07-09 Liquid crystal display device Active 2031-03-07 US8902378B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2009-0062683 2009-07-09
KR1020090062683A KR101338116B1 (ko) 2009-07-09 2009-07-09 액정표시장치

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US20110007242A1 US20110007242A1 (en) 2011-01-13
US8902378B2 true US8902378B2 (en) 2014-12-02

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US (1) US8902378B2 (ko)
KR (1) KR101338116B1 (ko)
CN (1) CN101950098A (ko)
DE (1) DE102010030043B4 (ko)
TW (1) TW201102723A (ko)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9666561B2 (en) 2015-10-12 2017-05-30 Samsung Electronics Co., Ltd. Light emitting device package and lighting apparatus including the same
US9954028B2 (en) 2016-08-11 2018-04-24 Samsung Electronics Co., Ltd. Light emitting device package and display device using the same

Families Citing this family (11)

* Cited by examiner, † Cited by third party
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US20130148381A1 (en) * 2010-08-25 2013-06-13 Sharp Kabushiki Kaisha Display device
KR20140025743A (ko) 2012-08-22 2014-03-05 삼성디스플레이 주식회사 표시 장치
KR20140064393A (ko) 2012-11-20 2014-05-28 서울반도체 주식회사 백라이트 유닛
KR20140067626A (ko) * 2012-11-27 2014-06-05 삼성디스플레이 주식회사 표시 장치
CN104421768B (zh) * 2013-09-06 2017-09-05 群创光电股份有限公司 背光模块及显示装置
KR102123073B1 (ko) * 2013-11-18 2020-06-15 엘지디스플레이 주식회사 백라이트 유닛 및 이를 포함하는 액정표시장치
KR102257201B1 (ko) * 2014-12-10 2021-05-28 엘지디스플레이 주식회사 백라이트 유닛 및 이를 포함하는 액정표시장치
KR102378723B1 (ko) * 2015-09-21 2022-03-28 삼성전자주식회사 디스플레이 장치
CN105223732B (zh) * 2015-10-23 2018-03-16 京东方光科技有限公司 背光源及显示装置
US10495925B2 (en) * 2017-12-28 2019-12-03 Huizhou China Star Optoelectronics Technology Co., Ltd. Backlight module and display device
CN109085721B (zh) * 2018-09-11 2021-11-16 昆山龙腾光电股份有限公司 背光模组及液晶显示装置

Citations (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5499120A (en) 1992-06-26 1996-03-12 Motorola, Inc. Liquid crystal device having LEDs of a wide polar lighting angle, the polar angle determining the LEDs spacing
TW285714B (ko) 1994-10-03 1996-09-11 Rohm Co Ltd
TW200425803A (en) 2003-05-15 2004-11-16 Toppoly Optoelectronics Corp Circuit board having reflection function, light-emitting module including the circuit board, and flat display including the circuit board
US20050030443A1 (en) * 2002-03-29 2005-02-10 Hiroshi Nagahama Illumination unit and liquid crystal display apparatus comprising same
US20050254258A1 (en) 2004-05-07 2005-11-17 Samsung Electronics Co., Ltd. Light emitting diode module and a flat panel display provided with the same
CN2743867Y (zh) 2004-10-18 2005-11-30 三和企业股份有限公司 导光板
US20060097364A1 (en) * 2004-11-05 2006-05-11 Seiko Epson Corporation Electro-optical device and electronic apparatus
TWI261944B (en) 2004-01-16 2006-09-11 Tzu-Shan Liu Double-powered battery
CN1866110A (zh) 2006-06-12 2006-11-22 友达光电股份有限公司 背光模块及其组装方法
DE102005033982A1 (de) 2005-07-20 2007-02-01 Siemens Ag Anzeigeeinheit
US20070058392A1 (en) 2005-09-09 2007-03-15 Citizen Electronics Co., Ltd. Lighting device
JP2007080520A (ja) 2005-09-09 2007-03-29 Harison Toshiba Lighting Corp バックライト装置
US20070076140A1 (en) 2005-09-30 2007-04-05 Innolux Display Corp. Liquid crystal module with light guide plate having TFT array thereon
JP2007127962A (ja) 2005-11-07 2007-05-24 Toshiba Matsushita Display Technology Co Ltd 液晶表示装置
CN1971374A (zh) 2005-11-25 2007-05-30 群康科技(深圳)有限公司 液晶显示装置
US7292290B2 (en) * 2004-06-25 2007-11-06 Seiko Epson Corporation Electro-optical device and electronic apparatus
US20080074902A1 (en) 2006-09-25 2008-03-27 Samsung Electronics Co., Ltd. Lcd backlight assembly with leds
US7359012B2 (en) * 2004-07-13 2008-04-15 Sharp Kabushiki Kaisha Liquid crystal display device
TW200825555A (en) 2006-12-08 2008-06-16 Chi Mei Optoelectronics Corp Back light module and liquid crystal display device
DE102006060758A1 (de) 2006-12-21 2008-07-03 Siemens Home And Office Communication Devices Gmbh & Co. Kg Display-Modul
US20090116262A1 (en) 2007-11-06 2009-05-07 Dong Wook Park Light unit and display device having the same
US20100164362A1 (en) * 2007-05-18 2010-07-01 Denki Kagaku Kogyo Kabushiki Kaisha Metal base circuit board
US20100253872A1 (en) * 2009-04-01 2010-10-07 Byung-In Park Liquid crystal display device including led light source
US20110205453A1 (en) * 2008-10-23 2011-08-25 Sharp Kabushiki Kaisha Illumination device, surface illuminant device, display device, and television receiver

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005258054A (ja) * 2004-03-11 2005-09-22 Sharp Corp 光源装置及び液晶表示装置
JP2006058741A (ja) * 2004-08-23 2006-03-02 Optrex Corp 液晶表示装置
CN201083927Y (zh) * 2007-08-08 2008-07-09 群康科技(深圳)有限公司 液晶显示装置

Patent Citations (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5499120A (en) 1992-06-26 1996-03-12 Motorola, Inc. Liquid crystal device having LEDs of a wide polar lighting angle, the polar angle determining the LEDs spacing
DE69316010T2 (de) 1992-06-26 1998-06-10 Motorola As Anzeige
TW285714B (ko) 1994-10-03 1996-09-11 Rohm Co Ltd
US20050030443A1 (en) * 2002-03-29 2005-02-10 Hiroshi Nagahama Illumination unit and liquid crystal display apparatus comprising same
TW200425803A (en) 2003-05-15 2004-11-16 Toppoly Optoelectronics Corp Circuit board having reflection function, light-emitting module including the circuit board, and flat display including the circuit board
TWI261944B (en) 2004-01-16 2006-09-11 Tzu-Shan Liu Double-powered battery
US20050254258A1 (en) 2004-05-07 2005-11-17 Samsung Electronics Co., Ltd. Light emitting diode module and a flat panel display provided with the same
US7292290B2 (en) * 2004-06-25 2007-11-06 Seiko Epson Corporation Electro-optical device and electronic apparatus
US7359012B2 (en) * 2004-07-13 2008-04-15 Sharp Kabushiki Kaisha Liquid crystal display device
CN2743867Y (zh) 2004-10-18 2005-11-30 三和企业股份有限公司 导光板
US20060097364A1 (en) * 2004-11-05 2006-05-11 Seiko Epson Corporation Electro-optical device and electronic apparatus
US7557451B2 (en) * 2004-11-05 2009-07-07 Seiko Epson Corporation Electro-optical device and electronic apparatus
DE102005033982A1 (de) 2005-07-20 2007-02-01 Siemens Ag Anzeigeeinheit
US20070058392A1 (en) 2005-09-09 2007-03-15 Citizen Electronics Co., Ltd. Lighting device
JP2007080544A (ja) 2005-09-09 2007-03-29 Citizen Electronics Co Ltd 照明装置
JP2007080520A (ja) 2005-09-09 2007-03-29 Harison Toshiba Lighting Corp バックライト装置
US20070076140A1 (en) 2005-09-30 2007-04-05 Innolux Display Corp. Liquid crystal module with light guide plate having TFT array thereon
JP2007127962A (ja) 2005-11-07 2007-05-24 Toshiba Matsushita Display Technology Co Ltd 液晶表示装置
CN1971374A (zh) 2005-11-25 2007-05-30 群康科技(深圳)有限公司 液晶显示装置
CN1866110A (zh) 2006-06-12 2006-11-22 友达光电股份有限公司 背光模块及其组装方法
US20080074902A1 (en) 2006-09-25 2008-03-27 Samsung Electronics Co., Ltd. Lcd backlight assembly with leds
TW200825555A (en) 2006-12-08 2008-06-16 Chi Mei Optoelectronics Corp Back light module and liquid crystal display device
DE102006060758A1 (de) 2006-12-21 2008-07-03 Siemens Home And Office Communication Devices Gmbh & Co. Kg Display-Modul
US20100164362A1 (en) * 2007-05-18 2010-07-01 Denki Kagaku Kogyo Kabushiki Kaisha Metal base circuit board
US20090116262A1 (en) 2007-11-06 2009-05-07 Dong Wook Park Light unit and display device having the same
KR20090046417A (ko) 2007-11-06 2009-05-11 엘지이노텍 주식회사 라이트 유닛
US20110205453A1 (en) * 2008-10-23 2011-08-25 Sharp Kabushiki Kaisha Illumination device, surface illuminant device, display device, and television receiver
US20100253872A1 (en) * 2009-04-01 2010-10-07 Byung-In Park Liquid crystal display device including led light source

Non-Patent Citations (7)

* Cited by examiner, † Cited by third party
Title
Chinese Office Action in corresponding Chinese patent application 201010226774.8 with English translation.
German Office Action in corresponding German Application No. 10 2010 030 043.8 dated Dec. 7, 2011.
Office Action dated Apr. 30, 2014, issued by the State Intellectual Property Office of China in Chinese Patent Application No. 201010226774.8.
Office Action dated Aug. 27, 2013 from the Taiwan Intellectual Property Office in Taiwanese counterpart application No. 099112776.
Office Action dated Jul. 26, 2013 from the Korean Intellectual Property Office in counterpart application No. 10-2009-0062683.
Office Action from the Korean Intellectual Property Office dated Jan. 31, 2013 in counterpart application No. 10-2009-0062683.
Office Action from the Taiwanese Intellectual Property Office dated Mar. 6, 2013 in counterpart application No. 099122776.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9666561B2 (en) 2015-10-12 2017-05-30 Samsung Electronics Co., Ltd. Light emitting device package and lighting apparatus including the same
US9954028B2 (en) 2016-08-11 2018-04-24 Samsung Electronics Co., Ltd. Light emitting device package and display device using the same

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TW201102723A (en) 2011-01-16

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